Webalizer stats only showing 1 or 2 days?

Hi, first post here - been using ispconfig3 for a while now, and although there are some tweaks to the how to's - and some better documentation would be nice!

Anyway - Webalizer, when I type in 'www.example.net/stats' and enter my username and password, it only displays stats for the day/previous day.. likewise my stats for last month only show July 31st... it's like webalizer is forgetting to parse/store results..

Anyone else seeing this, or can anyone suggest the best fix for this - I have my own ideas, but don't want to edit in case of inadvertent effects on ispconfig.